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Soft polypropylene composition with improved optical behavior

Active Publication Date: 2022-10-11
BOREALIS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a polyolefin composition based on a heterophasic propylene copolymer (TERHECO) and a styrenic thermoplastic (sTPE). The heterophasic propylene copolymer (TERHECO) consists of units derived from propylene, ethylene, and 1-hexene. The polyolefin composition (C) comprises a heterophasic propylene copolymer (TERHECO) and a styrenic thermoplastic elastomer (sTPE) in a specific weight ratio. The composition has specific properties, such as a specific matrix and elastomer content, as well as a specific xylene cold soluble fraction. The invention also includes articles, such as packaging material, made from the polyolefin composition (C) and a process for producing sterilized articles. The technical effects of the invention include improved properties and a simplified production process.

Problems solved by technology

Steam sterilisation is usually carried out in a temperature range of about 120 to 130° C. Of course, treatment of a polymer under the sterilization conditions outlined above can impair its final properties.
However, it has turned out that standard heterophasic systems change significantly their properties after sterilization.
Typically the optical properties as well as the mechanical properties are undesirable impaired.

Method used

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  • Soft polypropylene composition with improved optical behavior
  • Soft polypropylene composition with improved optical behavior

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1. Measuring Methods

[0225]The following definitions of terms and determination methods apply for the above general description of the invention as well as to the below examples unless otherwise defined. MFR2 (230° C.) is measured according to ISO 1133 (230° C., 2.16 kg load).

[0226]Quantification of Microstructure by NMR Spectroscopy

[0227]Comonomer content (ethylene): Quantitative 13C {1H} NMR spectra were recorded in the solution-state using a Bruker Advance III 400 NMR spectrometer operating at 400.15 and 100.62 MHz for 1H and 13C respectively. All spectra were recorded using a 13C optimized 10 mm extended temperature probehead at 125° C. using nitrogen gas for all pneumatics. Approximately 200 mg of material was dissolved in 3 ml of 1,2-tetrachloroethane-d2 (TCE-d2) along with chromium-(III)-acetylacetonate (Cr(acac)3) resulting in a 65 mM solution of relaxation agent in solvent as described in G. Singh, A. Kothari, V. Gupta, Polymer Testing 2009, 28(5), 475.

[0228]To ensure a homo...

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Abstract

The present invention is directed to a polyolefin composition (C) containing a heterophasic propylene copolymer (TERHECO) and a styrenic thermoplastic (sTPE), wherein the heterophasic propylene copolymer (TERHECO) consists of units derived from propylene, ethylene and 1-hexene. Further the present invention is directed to articles made from the polyolefin composition (C) as well as to the production of sterilized articles.

Description

CROSS REFERENCE TO RELATED APPLICATION(S)[0001]The present application is a national stage entry under 35 U.S.C. § 371 of International Application No. PCT / EP2020 / 061658 filed on Apr. 28, 2020, which claims priority to EP Application No. 19171591.1 filed on Apr. 29, 2019.FIELD OF INVENTION[0002]The present invention is directed to a polyolefin composition (C) containing a heterophasic propylene copolymer (TERHECO) and a styrenic thermoplastic (sTPE), wherein the heterophasic propylene copolymer (TERHECO) consists of units derived from propylene, ethylene and 1-hexene. Further the present invention is directed to articles made from the polyolefin composition (C) as well as to the production of sterilized articles.BACKGROUND[0003]There is an increasing trend in the medical packaging industry to use plastic containers, notably pouches or closed bags containing sterilized liquids or gels, like infusion solutions. Retort pouches or closed bags offer many advantages over rigid metal packa...

Claims

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Application Information

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IPC IPC(8): C08L23/14C08L53/02
CPCC08L23/142C08L53/02C08L2205/025C08L2205/03C08L2207/02C08L2201/10C08L2314/06C08F210/06C08F4/65912C08F4/65908C08F4/65927C08L23/16C08L53/025C08F2/001C08F4/6492C08F210/14C08F2500/12C08F210/16C08F2500/17C08F2500/27C08F2500/30C08F2500/31C08F2500/39C08F2500/32C08F2500/33C08F2500/34
Inventor WANG, JINGBOGAHLEITNER, MARKUSBERNREITNER, KLAUSLESKINEN, PAULI
Owner BOREALIS AG